Surface treatment device

Abstract: The present invention relates to a surface treatment device for performing a surface treatment such as plating by feeding a treating liquid to an internal peripheral surface of a cylindrical portion of a work wherein a jig to be connected to said work includes a seal member adapted to be inserted to an opened portion of said cylindrical portion of the work and that seal operating means are provided for imparting an outwardly inflating force to the seal member in order to seal the inner periphery of the cylindrical portion of the work. Alternatively, the seal member can also be attached directly to a tip end of a fluid passage constituting member such as an electrode providing seal operating means as well which assure an inflating force to be provided so that the seal member is maintained in pressure engagement within said periphery of the cylindrical portion of the work.

Description: This invention relates to a surface treatment device for carrying out a surface treating method applied for a plating treatment, a pretreatment therefor, etc. in the plating of an inside periphery of a cylindrical portion of a works, such as a cylinder block of an engine, and especially for subjecting a surface to be treated to a high speed surface treatment while allowing a treating liquid to flow. A variety of techniques concerning surface treatment such as plating of a surface to be treated of a work or a degreasing treatment as a pretreatment therefor have been hitherto known (DE 39 37 763 C2, FR 2 685 924 A1). For example, a method is generally known in which a work is immersed in a treating liquid contained in a tank for performing plating, etc. This method, however, requires a long treatment time and is not efficient. Additionally, this method requires high costs for the treatment of a waste liquid, etc. Thus, a method is proposed in which a treating liquid is allowed to flow relative to a surface to be treated of a work with a view toward improving the treating efficiency and realizing a high speed treatment. For example, Japanese Examined Patent Publication No. 1-52480 discloses a surface treatment device applied for the degreasing treatment in chrome plating of an inside surface of a cylinder of an engine, in which each of the openings at both ends of the engine cylinder is plugged with a plug through a sealing material. One of the plugs is provided with a treating liquid feed passage while the other plug is provided with a treating liquid return passage. The both passages are in fluid communication with the inside space of the cylinder. A tank for the treating liquid, a pump, valves, etc. are connected to a piping system including the above passages. In the thus constructed device, the treating liquid is recirculated with a pump through the treating liquid feed passage--inside of the cylinder--treating liquid return passage--tank. The flow of the treating liquid through the inside of the cylinder permits a high speed treatment of the inside the surface the cylinder. While the above publication mainly describes a case in which the device is applied for a degreasing step, it is also effective to allow a plating liquid to flow relative to a surface to be treated of a work in a plating step. Especially when an inside peripheral surface of a cylindrical portion of a cylinder or the like is subjected to plating, a high speed plating treatment can be accomplished by applying a voltage with an increased current density to electrodes disposed in the cylindrical portion while permitting a plating liquid to flow in the state where the opened portions are sealed. In case where the surface treatment is carried out while passing a treating liquid through the inside of a cylinder as described above, it is necessary to seal the opened portions of the cylinder. In the above-mentioned publication, an end face of each of the opened portions of both sides of the cylinder is applied and pressed with a sealing material and a plug to effect the sealing. When the cylindrical portion has one side provided with a portion having a different shape such as a wall defining a crank chamber in a cylinder block of an ordinary automobile, however, the sealing structure as above cannot achieve the seal. Namely, because a cylinder block of an automobile generally has a structure in which a portion having a plurality of cylinders is integrally connected to a wall defining a skirt-like crank chamber connected to one side (underside in use) of the cylinder-disposed portion, it is difficult to apply and press a sealing material from outside of the opened portion of the cylinder on the side to which the crank chamber-defining wall is connected so that the seal is apt to be incomplete. When the seal is incomplete, the treating liquid leaks out of the cylinder to adversely affect the treatment performance of the plating and to cause the deposition of the treating liquid on the outside of the cylinder. This is also undesirable from the standpoint of safety. With the foregoing circumstances in view, it is an object of the present invention to provide a surface treatment device which permits a high speed treatment, such as plating, of an inside surface of a cylindrical portion of a cylinder or the like body by allowing a treating liquid to flow, which can surely achieve the sealing of opened portions of a work such as a cylinder block to which a crank chamber-defining wall is connected, which can allow the treating liquid to flow in the inside of the cylindrical portion in a satisfactory manner, and which can perform an effective, high speed surface treatment. In accomplishing the foregoing objective, the present invention provides a surface treating device for performing a surface treatment such as plating, being capable of feeding a treating liquid to an inside peripheral surface of a cylindrical portion of a work to be treated being insertable into said device, wherein a treatment device main body disposed in a work treatment section includes a work supporting portion for supporting said insertable work such that an opened portion of one side of said insertable cylindrical portion is closable, a fluid passage constituting member being capable of providing a fluid passage for said treating liquid in the inside of said cylindrical portion of said insertable work maintainable in the supported state, and treating liquid feeding and discharging paths both of which are capable of coming in fluid communication with said fluid passage of said fluid passage constituting member with said treating liquid feeding path being connected to treating liquid feeding means, characterized in that the surface treating device further comprise a jig being connectable to said insertable work includes a seal member adapted to be insertable into an opened portion of an opposite side of the work supporting side of said insertable cylindrical portion, and seal forming means for imparting a radially outwardly inflating force to said seal member so that the outer periphery of said seal member is capable of maintaining a pressure engagement with the inside periphery of said cylindrical portion of said insertable work. Preferrably, the seal member includes an engaging plate engageable with an edge portion of the opened portion of the cylindrical portion of the work, a seal pressing plate opposite the engaging plate, and an elastic sealing material interposed between the engaging plate and the seal pressing plate and wherein the seal operating means includes a rod connected to the seal pressing plate, and means for displacing the rod in such a direction that the seal pressing plate approaches the engaging plate, whereby the elastic sealing material is imparted with the outwardly inflating force when a compressing force is applied through the seal pressing plate to the elastic sealing material in the lengthwise direction of the cylindrical portion. According to another preferred embodiment the seal member includes a plate-like, elastic sealing member attached to the jig through an attaching member such that the elastic sealing member is located inside of the opened portion of the cylindrical portion of the work and wherein the seal operating means includes a tension member for applying a compressing force to the elastic sealing member in the lengthwise direction of the cylindrical portion, and means for operating the tension member. According to yet another preferred embodiment of the present invention the seal member includes a flat air tube attached to the jig through an attaching member such that the flat air tube is located inside of the opened portion of the cylindrical portion of the work and wherein the seal operating means includes air feeding and discharging means for feeding compressed air to the air tube and thereby imparting the outwardly inflating force to the air tube. Advantageously, the seal member includes an annular, elastic body capable of radially expanding and shrinking and secured by a supporting frame attached to the jig such that the elastic body is located inside of the opened portion of the cylindrical portion of the work when the jig is connected to the work and wherein the seal operating means includes a liquid feeding chamber defined inside of the elastic body secured by the supporting frame, and a liquid introducing port formed in the supporting frame such that a part of the treating liquid, which flows within the cylindrical portion of the work when the work is supported on the work supporting portion of the treatment device main body, is permitted to be introduced into the liquid feeding chamber, so that the elastic body is outwardly expanded by a pressure of the treating liquid flowing into the liquid feeding chamber. Alternatively, in order to perform the aforeindicated objective the present invention concerns a surface treating device according to claim 6 according to which a seal member is attached to a tip end of the fluid passage constituting member at a position inside of an opened portion of an opposite side of the work supporting side of the cylindrical portion when the work is supported by the work supporting portion, and wherein seal operating means is provided for imparting an outwardly inflating force to the seal member so that the outer periphery of the seal member is maintained in pressure engagement with the inside periphery of the cylindrical portion of the work. According to a preferred embodiment of said alternative surface treatment device the seal member includes a plate-like, elastic sealing member attached to the tip end of the fluid passage constituting member and wherein the seal operating means includes a pressing member for applying a compressing force to the elastic sealing member in the lengthwise direction of the fluid constituting member, and means for operating the pressing member. Preferrably, the seal member includes a flat air tube attached to the tip end of the fluid constituting member and wherein the seal operating means includes air feeding and discharging means for feeding compressed air to the air tube and thereby imparting the outwardly inflating force to the air tube. According to another advantageous embodiment the seal member includes an annular, elastic body capable of radially expanding and shrinking and secured by a supporting frame attached to the tip end of the fluid passage constituting member and wherein the seal operating means includes a liquid feeding chamber defined inside of the elastic body secured by the supporting frame, and a liquid introducing port formed in the supporting frame such that a part of the treating liquid, which flows within the cylindrical portion of the work when the work is supported on the work supporting portion of the treatment device main body, is permitted to be introduced into the liquid feeding chamber, so that the elastic body is outwardly expanded by a pressure of the treating liquid flowing into the liquid feeding chamber. According to the present invention, the treating liquid fed by the treating liquid feed means is allowed to pass through the treating liquid feeding passage and the passage in the cylindrical portion of the work to the treating liquid discharging passage while closing the opened portion of one side of the work with the work supporting portion of the treatment device main body and while closing the opened portion of the cylindrical portion, which is not closed with the work supporting portion, with the seal member, so that the the surface treatment is performed at a high speed in the state where the treating liquid is recirculated. The sealing of the opened portion of the cylindrical portion with the seal member is effected by the pressure engagement of the seal member with the inside peripheral surface of the cylindrical portion by the outwardly inflating force applied to the seal member. When the seal member and the seal operating means are preferrably constructed as mentioned in claims 2 and 3, the elastic sealing material is brought into pressure engagement with the inside periphery of the opened portion of the cylindrical portion by being inflated outwardly in response to the compression force acting in the vertical direction. When the seal member and the seal operating means are constructed as recited in Claim 3, the elastic sealing material is brought into pressure engagement with the inside periphery of the opened portion of the cylindrical portion by being inflated outwardly in response to the compression force acting in the vertical direction. When the seal member and the seal operating means are preferrably constructed as recited in Claim 4, the air tube is brought into pressure engagement with the inside periphery of the opened portion of the cylindrical portion by being inflated outwardly in response to the feeding of the compressed air to the air tube. When the seal member and the seal operating means are preferrably constructed as recited in Claim 5, the seal member composed of the elastic body is brought into pressure engagement with the inside periphery of the opened portion of the cylindrical portion by being inflated outwardly in response to the pressure of the treating liquid flowing into the liquid feeding chamber. Alternatively, the present invention can be performed in that the seal member provided on the tip end of the electrode is brought into pressure contact with the inside surface of the cylindrical portion upon actuation thereof by the seal operating means, thereby to accomplish the sealing of the opened portion of the cylindrical portion. Preferrably, this can be performed when the elastic sealing material to be brought into pressure engagement with the inside periphery of the opened portion of the cylindrical portion by being inflated outwardly in response to the compression force acting in the vertical direction. According to the preferred embodiment of claim 8 the air tube is brought into pressure engagement with the inside periphery of the opened portion of the cylindrical portion by being inflated outwardly in response to the feeding of the compressed air to the air tube. When the seal member and the seal portion operating means are preferrably constructed as claimed in claim 9, the seal member composed of the elastic body is brought into pressure engagement with the inside periphery of the opened portion of the cylindrical portion by being inflated outwardly in response to the pressure of the treating liquid flowing into the liquid feeding chamber. In the following the present invention is explained in greater detail by means of several embodiments thereof in conjunction with the accompanying drawings wherein: Fig. 1 is a plan view schematically showing the whole plating treatment system to which the device of the present invention is applied. Fig. 2 is an elevational view schematically showing the plating treatment system. Fig. 3 is a view showing a piping system for a high speed plating in a plating treatment section. Fig. 4 is a plan view showing part of the piping system. Fig. 5 is an elevational, vertical cross-sectional view showing one embodiment of a surface treatment device according to the present invention applied to the plating section. Fig. 6 is a vertical cross-sectional, side view of the surface treatment device. Fig. 7 is a sectional view taken on the line VII-VII in Fig. 6. Fig. 8 is an enlarged sectional view showing a sealed portion of an upper opened portion of a cylindrical portion of a work. Fig. 9 is a plan view showing one embodiment of a seal portion provided in an upper surface of a supporting block. Fig. 10 is a sectional view of the seal portion. Fig. 11 is plan view showing another embodiment of the seal portion provided in an upper surface of the supporting block. Fig. 12 is a sectional view of the seal portion. Fig. 13 is a view showing another embodiment of the piping system for the high speed plating in the plating treatment section. Fig. 14 is a vertical cross-sectional front view showing the pretreatment section. Fig. 15 is a vertical cross-sectional side view of the pretreatment section. Fig. 16 is an elevational, vertical cross-sectional view showing another embodiment of the surface treatment device. Fig. 17 is a vertical cross-sectional, side view of the surface treatment device. Fig. 18 is an enlarged, sectional view showing a sealed portion of an upper opened portion of a cylindrical portion of a work in the treatment section. Fig. 19 is an elevational, vertical cross-sectional view showing a third embodiment of the surface treatment device. Fig. 20 is a vertical cross-sectional, side view of the surface treatment device. Fig. 21 is an enlarged, sectional view showing a sealed portion of an upper opened portion of a cylindrical portion of a work in the treatment section. Fig. 22 is a sectional view showing a fourth embodiment of the seal member and the seal operating means. Fig. 23 is a sectional view showing a fifth embodiment of the seal member and the seal operating means. Fig. 24 is a sectional view showing a sixth embodiment of the seal member and the seal operating means. Fig. 25 is a sectional view showing a seventh embodiment of the seal member and the seal operating means. Fig. 26 is an enlarged sectional view showing the essential part of the seventh embodiment. Fig. 27 is a sectional view showing an eighth embodiment of the seal member and the seal operating means. Fig. 28 is a vertical cross-sectional front view showing another embodiment of the pretreatment section. Fig. 29 is a vertical cross-sectional side view of the pretreatment section. Fig. 30 is a schematic front view showing another embodiment of the work transferring device. In this plating treatment system, treatment sections A-D for various pretreatments, a plating treatment section E and a drying section F are disposed along a plating treatment line in a disposition corresponding to the order of the operations. More particularly, a degreasing treatment section A, an alkali etching treatment section B, a mixed acid etching treatment section C, alumite treatment section D, a high speed plating treatment section E and a drying section F are arranged in this order. Water-washing sections Ga-Ge are provided between respective treatment sections of A-E and between the high speed plating section E and the drying section E. Also provided are a work feeding section 2 in the starting end side of the plating treatment line and a work delivery section 3 in the terminal end side of the plating treatment line. Disposed outside of the treatment line are degreasing liquid storage tank 4A, an alkali liquid storage tank 4B, a mixed acid liquid storage tank 4C, a mixed acid exhaust liquid tank 4C', an alumite liquid storage tank 4D and a plating liquid storage tank 4E. Treating liquid supply pumps 5A-5E and treating liquid supplying and discharging pipings (not shown in Figs. 1 ad 2) are provided between respective treating liquid tanks 4A-4E and the corresponding treatment sections A-E. Further, the plating treatment system is provided with rectifiers 6, an ion exchanger 7, a control panel 8, air exhaust fans 9 and a nitrogen oxide cleaner 10. A beam 11 extends above a transferring line. A plurality of work transferring devices 12 are moveably mounted along the beam 11. Each of the transferring devices 12 is provided with a chuck 13 moveable up and down and a driving device 14 for moving the chuck up and down. The transferring devices 12 are displaced along the beam 11 by a drive motor (not shown). The cylinder block 1 as the work is suspendedly supported by each of the transferring devices 12 by the grasping of a transferring jig 40 previously connected to an upper portion thereof with the chuck. Each of the treatment sections A-E is provided with not only parts which constitute the main part of the treatment device and which will be described in detail below but also position determining means and clamp means 15 for positioning and clamping the cylinder block 1 and the jig 40. Referring to Figs. 3 and 4 which depict a piping system for high speed plating in the plating treatment section, a treating liquid feed pipe 21 and a treating liquid recovering pipe 22 are provided between a treatment device main body 30 having a work supporting portion at an upper end thereof, and a tank 4E containing a treating liquid (plating liquid) and a pump 5E connected to the tank. The treating liquid feed pipe 21 has an upstream end connected to the pump 5E and two branched downstream ends connected to a hereinafter described treating liquid feeding path of the treatment device main body 30. The treating liquid recovering pipe 22 has an upstream end connected to a hereinafter described treating liquid discharging path of the treatment device main body 30 and a downstream end extending to the tank 4E. In the illustrated embodiment, there are provided four, juxtaposed, treating liquid recovering pipes 22 so as to suit for the case where the work is a cylinder block 1 of a four-cylinder engine. The treating liquid feed pipe 21 is provided with a main automatic valve 23 and a main manual valve 24 for adjusting the feed rate of the treating liquid, and with a by-pass 25 branched therefrom at a position upstream of the valves 23 and 24 and extending to the tank 4E for returning a superfluous liquid to the tank 4E. The by-pass 25 is provided with a by-pass automatic valve 26. On the other hand, the treating liquid recovering pipe 22 is provided with a flow rate sensor 27 and a flow rate controlling valve 28 for adjusting the flow rate of the recovered liquid. Figs. 5 and 6 illustrate a detailed structure of the plating treatment section. In these Figures, a supporting block 32 as a work supporting portion is provided on a base table 31. The cylinder block 1 is adapted to be supported on the supporting block 32 with one opened portion of the cylinder 1b being closed with the supporting block 32. More particularly, the cylinder block 1 has a unitary structure composed of a cylinder-constituting part 1a having four cylinders 1b and a skirt-like crank case part 1c and is supported on the supporting block 32 together with the jig 40 connected to an upper end of the crank case part 1c in an inverted state as seen from the state where the cylinder block is mounted on an automobile. In such a state, the lower opened portion (head-side opened portion) of each of the cylinders 1b is closed with the supporting block 32. The supporting block 32 has a laterally (in the direction along which the cylinders are arranged) extending, treating liquid feeding path 33 at a position beneath the cylinder disposition part 1a of the cylinder block 1. The liquid feeding path 33 has both ends connected to the treating liquid feed pipe 21 (see Fig. 3). The supporting block 32 has an upper surface provided with an opening 33a, which is in fluid communication with the treating liquid feeding path 33, at a position corresponding to each of the cylinders 1b of the cylinder block 1. Thus, in the state where the cylinder block 1 is supported on the supporting block 32, the lower side opened portion (head-side opened portion) of each of the cylinders 1b of the cylinder block 1 coincides with the corresponding opening 33a with their peripheral edges being maintained in close contact with each other. The treatment device main body 30 is provided with an electrode 34 which also serves to function as a fluid passage constituting member at a position corresponding to each of the cylinders 1b of the cylinder block 1. Each of the electrodes 34 is formed into a cylindrical shape and is mounted on a holder 35, which in turn is mounted on the base table 31, through a mounting member 36. Each electrode 34 extends through the treating liquid feeding path 33 and protrudes upward from the corresponding opening 33a. In the state where the cylinder block 1 is supported on the supporting block 32 as described above, each of the electrodes 34 is inserted into the corresponding cylinder 1b of the cylinder block 1 so that the upper end of the electrode 34 is positioned adjacent to an upper end of a cylinder bore with a determined space being defined between the outer peripheral surface of the electrode 34 and the inside peripheral surface of the cylinder. As a consequence, fluid passages 37 and 38 are defined inside and outside of the electrode 34 in each of the cylinders 1b of the cylinder block 1 and are in fluid communication with each other at upper ends thereof. The outer passage 37 is in fluid communication with the treating liquid feeding path 33. Each of the holders 35 is provided with a through hole which constitutes, together with the inside space of the mounting member, a treating liquid discharging path 39 which is in fluid communication with the passage 38 formed in the electrode 34. The treating liquid discharging path 39 is connected to each of the treating liquid recovering pipe 22 (see Figs. 3 and 4) through a connecting pipe 22a. The mounting member 36, holder 35 and connecting pipe 22a are formed of an electrically conductive material and are electrically connected to the rectifier. Incidentally, the position of each of the holders 35 is required to be precisely determined in a narrow space corresponding to the disposition of the corresponding cylinder 1b of the cylinder block. Further, the electrodes 34 are required to be electrically separated from each other. Thus, as shown in Fig. 7, each of the holders 35 is shaped into an ellipse with the shorter axis being oriented in the direction along which the electrodes are arranged and with the longer axis being oriented in the direction normal to the shorter axis and has a flange 35a extending outward from each end of the longer axis side and fixed to the base table 31 by bolts. The mounting member 36 is fixedly secured to the longer axis sides of the holder by bolts. The jig 40 connected to the cylinder block 1 is provided with a seal member adapted to be inserted into an upper opened portion (crank case side opened portion) of an opposite side of the supporting block side of each of the cylinders 1b, and with seal operating means for imparting an outwardly inflating force to the seal member so as to maintain the outer periphery of the seal member in pressure engagement with the inside periphery of the cylinder. In the present embodiment, the seal member and the seal operating means have constructions shown in Figs. 5, 6 and 8. In these Figures, the jig 40 has a plate 41 engageable with the upper end of the cylinder block 1. Further, at a position corresponding to each of the cylinders 1b of the cylinder block, the jig is provided with am engaging plate 42 for the cylinder 1b, a seal pressing plate 43 disposed below the engaging plate, an O-ring (elastic sealing material) 44 having a predetermined diameter corresponding to the diameter of the cylinder bore and interposed between the outer peripheral portions of the both plates 42 and 43, and a rod 45 connected to the seal pressing plate 43. The rod 45 is inserted into a through-hole of the plate 41 and is moveable up and down relative to the plate 41. An upper end portion of the rod 45 protrudes upward from the plate 41 and is provided with a thread 45a with which a nut member 46 is threadingly engaged. The rod 45 has a lower end portion located adjacent to the upper opened portion of the cylinder 1b. The engaging plate 42 is in fitting engagement with the rod 45 at the lower end portion of the rod and is moveable up and down relative to the rod 45. The seal pressing plate 43 is attached to the rod 45 for movement therewith. The both plates 42 and 43 and the O-ring 44 constitute the seal member for sealing the upper opened portion of the cylinder 1b. In the state where the cylinder block 1 and the jig 40 are connected with each other, the both plates 42 and 43 and the O-ring 44 are located inside of the upper opened portion of the cylinder 1b with the engaging plate 42 being engaged by a step formed between a cylinder wall and a crank shaft supporting wall 1d extending from the cylinder wall. The rod 45 and the nut member 46 constitute the seal operating means which serves to impart an upward pressing force to the O-ring 44. The seal section 48 between the upper surface of the supporting block 32 and the lower end of the cylinder block 1 may be constructed as shown, for example, in the structure shown in Figs. 9 and 10 or the structure shown in Figs. 11 and 12. In the embodiment shown in Figs. 9 and 10, a recessed portion 482 of a stepped state is formed around the periphery of each opened portion 33a of the supporting block 32. A seal member 481 formed from a predetermined number of interconnected, annular, flat packings is fitted into the recessed portion 482 to form the seal section 48. By the engagement of the seal member 481 with the lower end surface of the cylinder block 1, the leakage of the treating liquid is prevented and, at the same time, the deposition of the treating liquid on the lower end surface of the cylinder block 1 is prevented. In the embodiment shown in Figs. 11 and 12, a seal member 483 formed from a predetermined number of interconnected O-rings is fitted into an annular groove 484 formed around each of the opened portion 33a on the upper side of the supporting block 32 to form the seal section 48. By the engagement of the seal member 483 and the upper surface of the supporting block 32 in the vicinity of the opened portion 33a with the lower end surface of the cylinder block 1, the leakage of the treating liquid is prevented and, at the same time, the deposition of the treating liquid on the lower end surface of the cylinder block 1 is prevented. Next, the surface treatment with the device of the present embodiment will be described. In connecting the cylinder block 1 and the jig 40, the engaging plate 42, the seal pressing plate 43 and the O-ring 44 are first fitted into the upper opened portion of each of the cylinders 1b of the cylinder block 1. The upper end portion of each of the rod 45 is inserted into the through-hole of the plate 41 and is threadingly engaged with the nut member 46. Then, the nut member 46 is rotated to move the rod and thereby to displace the pressing plate 43 from the position shown by the two-dotted line to the position shown by the solid line in Fig. 8. As a result, the O-ring 44 is vertically compressed by the engaging plate 42 engaged by the upper end of the cylinder and the seal pressing plate 43 so that the O-ring 44 is outwardly inflated and is in pressure contact with the inside surface of the cylinder 1b. Thus, the upper opened portion of each of the cylinders 1b is sealed without hindrance of the crank case portion 1c of the upper portion of the cylinder block. The cylinder block thus connected to the jig is first conveyed from the work feeding section 2 to the degreasing treatment section A by the transfer device 12 and is placed on the work supporting portion of the degreasing treatment section A. After separation from the transfer device 12, the degreasing treatment is performed. Thereafter, the cylinder block is held by the transfer device 12 and is transferred to the water-wash section Ga. By repeating such operations, the desired treatment in the treating section, washing with water and transference are successively performed. To effect the treatment in the plating treatment section E, the plating liquid is supplied and recirculated by the piping system shown in Figs. 3 and 4 and an electrical energy is supplied to the electrode 34 shown in Figs. 5 and 6. By this, high speed plating of the inside surface of each of the cylinders 1b of the cylinder block 1 is performed. Namely, the plating liquid introduced from the treating liquid feed pipe 21 into the treating liquid feeding path 33 of the supporting block 32 is passed, as shown by the arrow in Fig. 6, through the fluid passage 37 between the outer peripheral surface of the electrode 34 and the inside peripheral surface of the cylinder and flows the upper portion of the cylinder into the fluid passage 38 formed inside of the electrode 34. The plating liquid is then allowed to flow through the treating liquid discharging path 39 to the treating liquid recovering pipe 22. During the movement of the plating liquid along the inside peripheral surface of the cylinder which is to be plated while impressing the voltage, a high speed plating is performed. In this case, since the upper opened portion of each of the cylinders 1b is sealed by the seal member and the seal operating means provided in the jig 40, the plating liquid flowing in the cylinder 1b is prevented from leaking out, so that the high speed plating treatment can be suitably carried out. The treating liquid feeding and discharging system may be so constructed that the recirculation of the treating liquid is performed by a self-feeding pump 29 disposed on the side of the treating liquid recovering pipe 22', as shown in Fig. 13. In this Figure, the treating liquid recovering pipe 22' connected to the treating liquid discharging path 39 of the treatment device main body 30 is gathered and the down stream end thereof is led to the tank 4E. In the treating liquid recovering pipe 22', there are disposed a flow rate controlling valve 28' and the self-feeding type pump 22' having a high section power. In the treating liquid feeding pipe 21' extending between the tank 4E and the treating liquid feeding path 33 of the treatment device main body 30, on the other hand, there are disposed an automatic valve 23', a manual valve 24' and a flow meter 27'. No pump is disposed on the side of the treating liquid feeding path. A by-path 25' having a by-path automatic valve 26' extends between the treating liquid feeding pipe 21' and a portion of the treating liquid recovering pipe 22' upstream of the pump 29. According to the above treating liquid feeding and discharging system, the treating liquid is sucked by the suction force of the pump 29 through the treating liquid discharging path 39. The suction force extends to the flow passages 37 and 38, the treating liquid feeding path 33 and the treating liquid feeding pipe 21' so that, in this embodiment, too, the treating liquid is recirculated in a suitable manner. In particular, since no pressure is applied to the treating liquid in the flow passages 37 and 38, the overflow of the plating liquid from the upper opened portion of the cylinder 1b is further surely prevented. While there is a possibility that a leakage of the liquid occurs in a piping system in which the treating liquid is recirculated by pressing with a pump on the side of the treating liquid feeding pipe, leakage of liquid in the piping is surely prevented by recirculating the treating liquid by means of a suction pump 29 according to this embodiment. The device of the present invention can be applied not only to the plating treatment section E but also to the pretreatment section. Figs. 14 and 15 depict a structure in which the device is applied to the pretreatment section. In these Figures, a supporting block 52 provided on a base table 51 of a treatment device main body 50 has the same construction as the supporting block 32 of the plating treatment section E and has a treating liquid feeding path 53 which is connected to a treating liquid feeding pipe (not shown). A cylindrical fluid passage constituting member 54 is disposed at a position corresponding to each of the cylinders 1b of the cylinder block 1. The fluid passage constituting member 54 has nearly the same shape and arrangement with the electrode 34 of the plating treatment section E and protrudes through the treating liquid feeding path 53 upward above am opening 53a. In the sate where the cylinder block 1 is supported on the supporting block 52, the fluid passage constituting member 54 is inserted into each of the cylinders 1b to form passages 57 and 58 in the outside and inside of the fluid passage constituting member 54. The lower end of the fluid passage constituting member 54 is fixed to the base table 51. The base table 51 is provided with a treating liquid discharging path 59 which includes a port 59a which is in fluid communication with the fluid passage 58 in the inside of each of the fluid passage constituting members 54, a communication passage 59b which is in fluid communication with the corresponding port 59a, and an outlet passage 59c which is in fluid communication with the communication passage 59b and extends downward. A treating liquid recovering pipe 22' is connected to the treating liquid discharging path 59. When the treatment is performed in the pretreatment section with the thus constructed treatment device main body 50, the cylinder block 1 is previously connected to the jig 40. In the state where the upper opened portion of each of the cylinders 1b is sealed with the seal member and the seal operating means provided in the jig, the cylinder block 1 and the jig 40 are supported on the supporting block 52. Then, the treating liquid which has been supplied by a pump (not shown) to the treating liquid feeding path 53 through the treating liquid feeding pipe is allowed to pass through the fluid passages 57 and 58 constituted from the fluid passage constituting member 54 in each of the cylinders of the cylinder block 1, thereby establish a flow of the treating liquid along the inside peripheral surface of the cylinder. By this, various pretreatments can be carried out at a high speed. By utilizing the fact that the upper opened portion of each of the cylinders 1b is sealed, water-washing operation in the water-washing sections Ga-Ge can be efficiently carried out. Namely, a work supporting portion capable of supporting the cylinder block 1 and the jig 40 thereon in the same manner as that in each treatment section is provided in each of the water-washing sections Ga-Ge. In addition, an injection nozzle for water-washing is provided on the work supporting portion at a position corresponding to each of the cylinders 1b. By injecting washing water from respective injection nozzles into the corresponding cylinders 1b of the cylinder block 1, the water-washing operation can be efficiently performed in one step. Such an operation has been conventionally carried out by immersing the works successively into a plurality of water-washing vessels. Thus, the water-washing operation time can be shortened and the space for the water-washing section can be reduced. Figs. 16-18 illustrate a second embodiment of the seal member and the seal operating means for sealing the upper opened portion of the cylinder block 1 (side opening of the crankcase). In these Figures, a jig 60 connected to the cylinder block 1 is provided with a columnar mounting member 62 at a position corresponding to each of the cylinders 1b of the cylinder block 1. The mounting member 62 extends downwardly from a plate 61, which engages with an upper end of the cylinder block 1, to a position adjacent to the upper opened portion of the cylinder 1b and has a lower end to which a nearly disk-like, elastic sealing member 63 formed of an elastic material such as a rubber is attached. A tension rod (tension member) 64 vertically extends through the mounting member 62 and the elastic sealing member 63 and is moveable up and down relative to the jig 60. The tension rod has a lower end to which a plate 64a positioned in the underside of the elastic sealing member 63 is secured. An air cylinder 65 is provided at an upper part of the jig 61 for serving as means for operating the tension member. The air cylinder 65 has a piston 66 therewithin to which the upper end of the tension rod 64 is connected. Disposed beneath the piston 66 is an air chamber 65a which is connected to a pressurized air feed section (not shown) through a port 65b. Thus, the air cylinder 65 is adapted to move the piston 66 and the tension rod 64 upward when the pressurized air is supplied. The tension rod 64 and the air cylinder 65 constitute the seal operating means. The structure of the treatment device main body 30 of the plating treatment section, etc. may be the same as that of the above-described first embodiment. According to this embodiment, in the connection of the cylinder block 1 and the jig 60, the jig 60 is first set in the state where the pressurized air is not fed to the air cylinder 65 and the elastic sealing member 63 is inserted into the upper opened portion of the cylinder 1b (the state shown by the two-dotted line in Fig. 18). Then, the pressurized air is fed to the air cylinder 65 to cause the plate 64a to move upward through the tension rod 64 as shown by the solid line in Fig. 13. As a result, the elastic sealing member 63a is compressed in the vertical direction and is outwardly inflated so that the outer periphery thereof is brought into pressure contact with the inside periphery of the cylinder. By this, the upper opened portion of each of the cylinders 1b of the cylinder block 1 is sealed. Figs. 19-21 illustrate a third embodiment of the seal member and the seal operating means for sealing the upper opened portion of the cylinder block 1 (side opening of the crankcase). In these Figures, a jig 70 connected to the cylinder block 1 is provided with a columnar mounting member 72 at a position corresponding to each of the cylinders 1b of the cylinder block 1. The mounting member 72 extends downwardly from a plate 71, which engages with an upper end of the cylinder block 1, to a position adjacent to the upper opened portion of the cylinder 1b and has a lower end to which a flat air tube 73 as the seal member is mounted. The air tube 73 is adapted to be supplied with air and has such a size and a shape that the outer periphery thereof is brought into the inside periphery of the cylinder when vertically compressed. The mounting member 72 is provided with an air port 74 connected to a pressurized air supply section (not shown) as air feeding means and with an air passage 75 which is in fluid communication with the air port 74 and which extends through the center of the mounting member 72. The air passage 75 has a lower end connected to the air tube 3 for fluid communication with the inside of the tube through a communication hole 76. Designated as 77 is a tension rod which vertically extends through the mounting member 72 and is moveable up and down relative to the jig 70. The tension rod 77 has a lower end to which a plate 77a positioned at the underside of the air tube 73 is secured and an upper end connected to a piston 79 of an air cylinder 78 provided at am upper part of the jig 71. Disposed beneath the piston 79 is an air chamber 78a which is connected to a pressurized air feed section (not shown) through a port 78b. Thus, the air cylinder 78 is adapted to move the piston 79 and the tension rod 77 upward when the pressurized air is supplied. The structure of the treatment device main body 30 of the plating treatment section, etc. may be the same as that of the above-described first embodiment. According to this embodiment, in the connection of the cylinder block 1 and the jig 70, the jig 70 is first set in the state where the pressurized air is not fed to the air air tube 73 and the cylinder 78 and the air tube 73 is inserted into the upper opened portion of the cylinder 1b (the state shown by the two-dotted line in Fig. 21). Then, the pressurized air is fed to the air tube 73 and the air cylinder 78 to cause the plate 77a to move upward as shown by the solid line in Fig. 13. As a result, the air tube 73 is compressed in the vertical direction and is outwardly inflated by the air pressure so that the outer periphery thereof is brought into pressure contact with the inside periphery of the cylinder. By this, the upper opened portion of each of the cylinders 1b of the cylinder block 1 is sealed. In this embodiment, the air feeding and discharging means including the air passage 75 and the mechanism including the tension rod and the air cylinder 78 for vertically pressurizing the air tube 73 constitute the seal operating means. It is, however, possible to omit the mechanism for vertically compressing the air tube 73. The seal operating means can be constituted only of the air feeding and discharging means for the air tube 73. Fig. 22 illustrates a fourth embodiment of the seal member and the seal operating means for sealing the upper opened portion of the cylinder block 1 (side opening of the crankcase). In this Figure, a supporting frame 82 for holding a seal member 83 is mounted, through a downwardly protruding mounting member 81, on a jig to which an upper end of the cylinder block 1 is to be connected. The supporting frame 82 has a circular plate having a diameter slightly smaller than that of the cylinder 1a, and a frame portion which has a U-shaped cross section, whose opening is oriented radially outward and which is formed on an lower side of the peripheral portion of the plate. The supporting frame is located in the upper opened portion of the cylinder block 1. Fitted into the supporting frame 82 is a seal member 83 formed from an annular shrinkable rubber (elastic body). A liquid feeding chamber 84 is defined in the frame portion of the supporting frame 82 at a position inside of the seal member 83. The liquid feeding chamber 84 has a liquid feed port 85 in the inner periphery thereof. The liquid feeding chamber 84 and the liquid feed port 85 constitute a seal operating means for causing the seal member 83 to be outwardly inflated with the utilization of the treating liquid flowing in the cylinder 1a. More particularly, the outer periphery of the liquid feeding chamber is closed by the seal member 83, while the inner periphery is in fluid communication with the fluid passage of the treating liquid in the cylinder 1a through the liquid feed port 85. A plurality of such liquid feed ports 85 are arranged along the peripheral direction with a predetermined interval. Thus, when the treating liquid is recirculated while maintaining the cylinder block 1 in a state where it is supported on the supporting block (not shown) of the treatment device main body, part of the treating liquid that flows through the fluid passages 37 and 38 (or 57 and 58) defined inside and outside of the electrode 34 (or fluid passage constituting member 54) within the cylinder 1a is allowed to be passed into the liquid feeding chamber 84 through the liquid feed ports 85. In the illustrated embodiment, the direction along which the treating liquid flows is reverse to that in the foregoing embodiments. Namely, though not specifically illustrated, the path which is in fluid communication with the fluid passage 38 formed inside of the electrode 34 (the path which corresponds to the treating liquid discharging path 39 in Fig. 5) is connected to the treating liquid feeding side while the path which is in fluid communication with the fluid passage 37 formed outside of the electrode 34 (the path which corresponds to the treating liquid feeding path 33 in Fig. 5) is connected to the treating liquid recovering side, so that the treating liquid is permitted to flow from the fluid passage 38 formed inside of the electrode 34 to the fluid passage 37 formed outside thereof. In this embodiment, when the treating liquid is recirculated while maintaining the cylinder block 1 in a state where it is supported on the supporting block of the treatment device main body, part of the treating liquid which flows within the cylinder 1a from the fluid passage 38 to the fluid passage 37 is permitted to enter the liquid feeding chamber 84, so that the seal member 38 is expanded radially outward by the liquid pressure thereof to cause the outer peripheral surface thereof to be brought into pressure contact with the inside peripheral surface of the cylinder 1a. As a result, the upper opened portion of the cylinder 1a is sealed. In particular, since, in the present embodiment, the seal member 83 is operated by utilization of the flowing treating liquid, no specific power source is needed for the operation of the seal member, ensuring the seal with a simple structure. Fig. 23 illustrates a fifth embodiment of the seal member and the seal operating means for sealing the upper opened portion (crankcase side opening) of the cylinder block 1. In this embodiment, a supporting frame 93 having a shape substantially similar to the supporting frame 82 of the above fourth embodiment is mounted through a mounting member 91 on a jig (not shown) to which an upper end of the cylinder block 1 is to be connected. The supporting frame 82 has a frame portion which has a U-shaped cross section and on an outer periphery of which a seal member 93 of a rubber tube (elastic body) is fixed. A liquid feeding chamber 94 is defined in the frame portion of the supporting frame 92 at a position inside of the seal member 93. The liquid feeding chamber 94 has a liquid feed port 95 in the inner periphery thereof. In this embodiment, too, part of the treating liquid that flows through the fluid passages 37 and 38 (or 57 and 58) defined inside and outside of the electrode 34 (or fluid passage constituting member 54) within the cylinder 1a is allowed to be passed into the liquid feeding chamber 94 through the liquid feed port 95, so that the seal member 93 formed of a rubber tube is expanded radially outward to be brought into pressure contact with the cylinder 1a. As a result, the upper opened portion of the cylinder 1a is sealed to give the function and effect nearly similar to those in the fourth embodiment. Fig. 24 illustrates a sixth embodiment of the seal member and the seal operating means for sealing the upper opened portion (crankcase side opening) of the cylinder block 1. This embodiment resembles the second embodiment (Figs. 16-18) in function. An elastic seal member 103 is mounted on the tip of the electrode 34 (or fluid passage constituting member 54). That is, on an upper end of the electrode 34 (or fluid passage constituting member 54), there are provided upwardly protruding seal mounting sections 101 arranged in the circumferential direction with a suitable interval. To the seal mounting sections 101, the elastic seal member which is formed of an elastic material such as a rubber and which is shaped into a substantially circular disc is attached together with a pair of plates 102 bonded to both sides of the elastic seal member 103. The elastic seal member 103 has a diameter which is slightly smaller, in an uncompressed state, than the diameter of the bore of the cylinder 1a. The jig (not shown) to be connected to an upper end of the cylinder block 1 is provided with a pressing member 104 for pressing the elastic seal member 103 from above and an operating means (not shown) for moving the pressing member up and down. The pressing member 104 and the operating means constitute the seal operating means. In this embodiment, when the cylinder block 1 is set on the supporting block (not shown) of the treatment device main body, the seal member 103 and the electrode 34 are inserted into the cylinder 1a at a position within the upper opened portion of the cylinder 1a. In this state, the pressing member 104 is moved downward by operation of, for example, an air cylinder, to press the upper plate 102 of the elastic seal member 103 from above. Thus, the elastic seal member 103 is vertically compressed with the simultaneous, outward expansion thereof, thereby to cause the outer periphery thereof to be brought into engagement with the inside periphery of the cylinder 1a. As a result, the upper opened portion of the cylinder 1a is sealed. In particular, since, in this embodiment, the elastic seal member 103 is mounted on the electrode 34 (or fluid passage constituting member 54) and is inserted into the cylinder 1a from below (head side) when the cylinder block is set on the treatment device main body, the elastic seal member 103 is more easily inserted into the cylinder 1a even when the shape of crankcase side is complicated as compared with the case in which the seal member is inserted into the cylinder from the crankcase side of the cylinder block. Further, the difference between the bore diameter of the cylinder 1a and the diameter of the elastic seal member 103 in an uncompressed state can be made small so as to advantageously reduce the expansion length of the elastic seal member 103. Figs. 25 and 26 illustrate a seventh embodiment of the seal member and the seal operating means for sealing the upper opened portion (crankcase side opening) of the cylinder block 1. This embodiment resembles the third embodiment (Figs. 19-21) in function. A seal member having an air tube 113 is mounted on the tip of the electrode 34 (or fluid passage constituting member 54). That is, on an upper end of the electrode 34 (or fluid passage constituting member 54), there is provided a seal mounting frame 111 having a treating liquid feeding hole 111a. To the mounting frame 111 is attached the seal member having the air tube 113 sandwiched between a pair of plates 112. On an upper surface of the seal member is provided an upwardly protruding connection section 114 having an air introduction hole 114 vertically extending for the fluid communication of the air tube 113. An o-ring 119 is mounted on the outer periphery of the connection section 114. The jig (not shown) to be connected to am upper end of the cylinder block 1 is provided with a rod 117 having a connector 116 to be fit into the connection section 114 and an air cylinder for moving the rod 117 up and down. The rod 117 has an air passage 117a therewithin for connection to a pressurized air supply source (not shown) through a hose 118. In this embodiment, when the cylinder block 1 is set on the supporting block (not shown) of the treatment device main body, the seal member having the air tube 113 and the electrode 34 are inserted into the cylinder 1a at a position within the upper opened portion of the cylinder 1a. In this state, the rod 117 is moved downward by operation of the air cylinder 115 so that the connector 116 is engaged by the connection section 114. When the pressurized air is fed from the pressurized air source to the air tube 113 through the hose 118, air passage 117a and air introduction hole, the air tube 113 is expanded outward, thereby to cause the outer periphery thereof to be brought into engagement with the inside periphery of the cylinder 1a. As a result, the upper opened portion of the cylinder 1a is sealed. In this embodiment, too, the insertion of the seal member into the cylinder is performed easily and the expansion length of the air tube 113 may be reduced. In the sixth or seventh embodiment, when the upper end of the cylinder block is not closed with the jig (for example, when the jig is omitted because of the use of a transferring device as shown in Fig. 30 as described hereinafter), the seal operating means (the combination of the pressing member 104 with the operating means therefor or the combination of the air cylinder 115 with the rod 117, etc.) may be provided on an upper portion of the treatment device main body while the pressing member 104 or the rod 117 is permitted to be inserted into the cylinder block from above after the cylinder block has been set on the treatment device main body. In this case, however, the seal operating means should be retracted sideward when the cylinder block is fed or discharged. Fig. 27 illustrates an eighth embodiment of the seal member and the seal operating means for sealing the upper opened portion (crankcase side opening) of the cylinder block 1. This embodiment resembles the fourth embodiment (Fig. 22) in function. An elastic seal member 123 and a supporting frame 122 for supporting same are mounted on the tip of the electrode 34 (or fluid passage constituting member 54). That is, on an upper end of the electrode 34 (or fluid passage constituting member 54), there is provided upwardly protruding seal mounting sections 121 to which the supporting frame 122 is secured. The supporting frame 122 has a frame portion which has a U-shaped cross section, which has a radially outwardly oriented opening and which is located at a lower peripheral portion of a circular plate. The seal member 123 of an annular shrinkable rubber (elastic body) is fitted into the supporting frame 122. A liquid feeding chamber 124 is formed in the frame portion of the supporting frame 122 at a position inside of the seal member 123. Liquid inlets 125 are formed on the inside periphery of the liquid feeding chamber 124. The liquid feeding chamber 124 and the liquid inlets 125 constitute the seal operating means for causing the seal member 123 to be outwardly expanded by the utilization of the treating liquid flowing in the cylinder 1a. The seal member 123 may be in the form of a rubber tube as shown in Fig. 23. In this embodiment, the upper opened portion of the cylinder 1a is sealed in the same manner as that of the fourth embodiment. In particular, since, according to this embodiment, the seal member 123 and the seal operating means are entirely provided on the side of the electrode 34 (or fluid passage constituting member 54), the structure and the seal operation can be greatly simplified. At the same time, the expansion length of the seal member 123 may be reduced. The structure for the seal of the upper opened portion of the cylinder 1a by the provision of the seal member and seal operating means as in each of the foregoing embodiments may be applicable to both the plating treatment section and the pretreatment section. In the plating treatment section E, however, the use of the above seal structure is highly important so as to improve the flow of the plating liquid toward the inside surface of each of the cylinders 1a and to improve the quality of the plating by preventing the plating liquid from depositing except the required portions. In the pretreatment section, on the other hand, deposition of the treating liquid in a slight amount on the crankcase of the cylinder block 1 is permissive. Therefore, the structure may be simplified by using an overflow system as shown in Figs. 28 and 29. Namely, in these Figures, the seal is omitted from the upper opened portion of each of the cylinders 1a of the cylinder block 1, though the structure of the treatment device main body 30 is the same as that in Figs. 14 and 15. The treating liquid fed to the treating liquid feeding path 53 by the treating liquid feeding means is passed, as shown by the arrow, through the fluid passage 57 between the fluid passage constituting member 54 and the interior surface of the cylinder, overflows from the upper end of the fluid passage constituting member 54 into the inner fluid passage 58 and is discharged through the treating liquid discharging path 59 to the treating liquid recovering side. By the action of the valves 23 and 24 (see Fig. 3) provided in the treating liquid feeding and discharging system, the feed rate of the treating liquid is controlled to adjust the amount of the overflowing liquid in an adequate range. With the above construction, too, the pretreatment may be uniformly performed at a high speed by the recirculation of the treating liquid. The construction is made simple. By the control of the treating liquid feeding rate, the overflowing amount is suitably adjusted, so that the amount of the treating liquid which deposits on portions other than the necessary portion (crankcase portion) may be minimized by permitting the overflowing liquid from the fluid passage 57 to immediately flow in the fluid passage 58. Further, the treating liquid is prevented from flowing outside. When the pretreatment section is constructed into an overflow type, the seal member for sealing the upper opened portion of the cylinder block 1 and the seal operating means in the plating section may be constructed as adopted in the treatment device main body of the foregoing sixth to eighth embodiments. On the other hand, when the seal member, etc. are mounted on the jig mounted on the upper end of the cylinder block as in the first to fifth embodiments, the above seal member, etc. may be used also in the pretreatment section. Fig. 30 depicts another embodiment of the work transferring device. The work transferring device 130 shown in this Figure as a whole is moveable along the transferring line and has a frame 132 vertically moveably supported on a supporting section 131. A pair of left and light chuck mechanisms 133A and 133B are mounted on the frame 132. The chuck mechanisms 133A and 133B have work shucks 134A and 134B capable of protruding and retracting at the opposing sides of the frame 132 and air cylinders 135A and 135B for driving the work chucks 134A and 134B, respectively, for clamping. By operation of the air cylinders 135A and 135B, the cylinder block 1 is clamped from both sides with the work chucks 134A and 134B. The chuck mechanisms 133A and 133B are each rotatably mounted on the frame 132 and are rotatable through an angle of 180 degrees by operation of an air cylinder 136 through a rack and a pinion (not shown). The frame 132 is moveable up and down by an air cylinder 137. With the above work transferring device 130, the work (cylinder block 1) is directly clamped by the chuck mechanisms 133A and 133B, the work is able to be displaced without using a transferring jig. This also enables to omit a station and operation for the mounting and dismounting of the work to and from the transferring jig. Thus, the cylinder block 1 is transferred by the work transferring device 130 through the surface treatment devices in the pretreatment and plating sections and through the recovering and washing vessels 141 and 142 disposed between adjacent treatment sections. In the recovering and washing vessels 141 and 142, for example, the cylinder block 1 is delivered between a work supporting section (not shown) moveably mounted up and down to the vessels and the work transferring device 130. When the cylinder block 1 has a complicated shape, the amount of water taken from the vessels 141 and 142 tends to increase. In this case, by driving the air cylinder 136 to rotate the cylinder block 1 and the chuck mechanisms 133A and 133B clamping same therebetween through 180 degrees, the water contained in the cylinder block 1 may be returned to the vessels 141 and 142, to thereby minimizing the loss of water. As described in the foregoing, since the surface treatment device according to the present invention includes a treatment device main body provided with a work supporting portion for supporting the work such that an opened portion of one side of the cylindrical portion is closed, a fluid passage constituting member providing a fluid passage for a treating liquid in the inside of the cylindrical portion and treating liquid feeding and discharging paths both of which are in fluid communication with the fluid passage, and a jig connected to the work and provided with a seal member adapted to be inserted into an opened portion of an opposite side of the work supporting side of the cylindrical portion and seal operating means for imparting am outwardly inflating force to the seal member so that the outer periphery of the seal member is maintained in pressure contact with the inside periphery of the cylindrical portion, the treating liquid can be passed through the inside of the cylindrical portion while maintaining the opened portion of the cylindrical portion in a sealed state so that the surface treatment can be carried out at a high speed. In particular, the treating liquid can be passed in a suitable manner by the formation of the fluid passage in the inside of the cylindrical portion. At the same time, the seal member and the seal operating means permit the opened portion to be surely sealed even if the work near the opened portion to be sealed with the seal member has a complicated shape. Thus, the high speed surface treatment can be effectively carried out. In the case of a construction in which the seal member is attached to a tip end of the fluid passage constituting member and in which seal operating means is provided for imparting the seal member with an outwardly inflating force so as to cause the outer surface of the seal member to be brought into pressure contact with the inside surface of the cylindrical portion of the work, the sealing of the opened portion of the cylindrical portion of the work can be surely attained while permitting the effective high speed surface treatment.

Claims: A surface treating device for performing a surface treatment such as plating, being capable of feeding a treating liquid to an inside peripheral surface of a cylindrical portion (1b) of a work (1) to be treated being insertable into said device, wherein a treatment device main body (30) disposed in a work treatment section (A-F) includes a work supporting portion (32) for supporting said insertable work (1) such that an opened portion of one side of said insertable cylindrical portion (1b) is closable, a fluid passage constituting member (34) being capable of providing a fluid passage (37, 38) for said treating liquid in the inside of said cylindrical portion (1b) of said insertable work (1) maintainable in the supported state, and treating liquid feeding (33) and discharging paths (39) both of which are capable of coming in fluid communication with said fluid passage (37, 38) of said fluid passage constituting member (34) with said treating liquid feeding path (33) being connected to treating liquid feeding means (21), characterized in that the surface treating device further comprises a jig (40; 60; 70) being connectable to said insertable work (1) includes a seal member (42, 43, 44) adapted to be insertable into an opened portion of an opposite side of the work supporting side of said insertable cylindrical portion (1b), and seal forming means for imparting a radially outwardly inflating force to said seal member (42, 43, 44) so that the outer periphery of said seal member (42, 43, 44) is capable of maintaining a pressure engagement with the inside periphery of said cylindrical portion (1b) of said insertable work (1). A surface treating device as claimed in claim 1, characterized in that said seal member includes an engaging plate (42) engageable with an edge portion of said opened portion of said cylindrical portion (1b) of said insertable work (1), a seal pressing plate (43) opposite said engaging plate (42), and an elastic sealing material (44) interposed between said engaging plate (42) and said seal pressing plate (43) and wherein said seal forming means includes a rod (45) connected to said seal pressing plate (43), and means (45a, 46) for displacing said rod (45) in such a direction that said seal pressing plate (43) approaches said engaging plate (42), whereby said elastic sealing material (44) is imparted with said radially outwardly inflating force when a compressing force is applied through said seal pressing plate (43) to said elastic sealing material (44) in the lengthwise direction of said insertable cylindrical portion (1b). A surface treating device as claimed in claim 1, characterized in that said seal member (62-65) includes a plate-like, elastic sealing member (63) attached to said jig (60) through an attaching member such that said elastic sealing member (63) is placable inside of said opened portion of said cylindrical portion (1b) of said insertable work (1) and wherein said seal forming means (65, 66) includes a tension member (62) for applying a compressing force to said elastic sealing member (63) in the lengthwise direction of said insertable cylindrical portion (16), and means (64, 65) for operating said tension member (62). A surface treating device as claimed in claim 1, characterized in that said seal member includes a flat air tube (73) attached to said jig (70) through an attaching member (72) such that said flat air tube (73) is placable inside of said opened portion of said cylindrical portion (1b) of said insertable work (1) and wherein said seal forming means includes air feeding and discharging means (75, 78) for feeding compressed air to said air tube (73) and thereby imparting said radially outwardly inflating force to said air tube (73). A surface treating device as claimed in claim 1, wherein said seal member includes an annular, elastic body (83-93) capable of radially expanding and shrinking and secured by a supporting frame (82; 92) attached to said jig such that said elastic body (83; 93) is placable inside of said opened portion of said cylindrical portion (1a) of said insertable work (1) when said jig is connected to said insertable work (1) and wherein said seal forming means (84, 85; 94, 95) includes a liquid feeding chamber (84; 94) defined inside of said elastic body (83; 93) secured by said supporting frame (82; 92), and a liquid introducing port (85; 95) formed in said supporting frame (82; 92) such that a part of said treating liquid, which is capable of flowing within said cylindrical portion (1a) of said insertable work (1) when said insertable work (1) is supported on said work supporting portion of said treatment device main body, is permitted to be introduced into said liquid feeding chamber (84; 94), so that said elastic body (83; 93) is radially outwardly expandable by a pressure of said treating liquid flowing into said liquid feeding chamber (84; 94). A surface treating device for performing a surface treatment such as plating, being capable of feeding a treating liquid to an inside peripheral surface of a cylindrical portion (la) of a work (1) to be treated being insertable into said device, wherein a treatment device main body (30) disposed in a work treatment section (A-F) includes a work supporting portion (32) for supporting said insertable work (1) such that an opened portion of one side of said insertable cylindrical portion (la) is closable, a fluid passage constituting member (34) being capable of providing a fluid passage (37, 38) for said treating liquid in the inside of said cylindrical portion (la) of said insertable work (1) maintainable in the supported state, and treating liquid feeding (33) and discharging paths (39) both of which are capable of coming in fluid communication with said fluid passage (37, 38) of said fluid passage constituting member (34) with said treating liquid feeding path (33) being connected to treating liquid feeding means (21), characterized in that the surface treating device further comprises a seal member (102, 103) is attached to a tip end of said fluid passage constituting member (34) adapted to be placable at a position inside of an opened portion of an opposite side of the work supporting side of said insertable cylindrical portion (la) when said insertable work (1) is supported by said work supporting portion, and in that seal forming means (104) is provided for imparting a radially outwardly inflating force to said seal member (103) so that the outer periphery of said seal member (103) is capable of maintaining a pressure engagement with the inside periphery of said cylindrical portion (la) of said insertable work (1). A surface treating device as claimed in claim 6, characterized in that said seal member includes a plate-like, elastic sealing member (103) attached to said tip end of said fluid passage constituting member (34) and wherein said seal forming means includes a pressing member (104) for applying a compressing force to said elastic sealing member (103) in the lengthwise direction of said fluid constituting member (34), and means for operating said pressing member (104). A surface treating device as claimed in claim 6, characterized in that said seal member includes a flat air tube (113) attached to said tip end of said fluid constituting member (34) and wherein said seal forming means includes air feeding and discharging means for feeding compressed air to said air tube (113) and thereby imparting said radially outwardly inflating force to said air tube (113). A surface treating device as claimed in claim 6, characterized in that said seal member includes an annular, elastic body (123) capable of radially expanding and shrinking and secured by a supporting frame (122) attached to said tip end of said fluid passage constituting member (34) and wherein said seal forming means includes a liquid feeding chamber (124) defined inside of said elastic body (123) secured by said supporting frame (122), and a liquid introducing port (125) formed in said supporting frame (122) such that a part of said treating liquid, which is capable of flowing within said cylindrical portion (la) of said insertable work (1)when said insertable work (1) is supported on said work supporting portion of said treatment device main body, is permitted to be introduced into said liquid feeding chamber (125), so that said elastic body (123) is outwardly expanded by a pressure of said treating liquid flowing into said liquid feeding chamber (124).

Inventors: IKEGAYA HIROHIKO, ISOBE MASAAKI, WATANABE MASAYUKI, IKEGAYA, HIROHIKO, ISOBE, MASAAKI, WATANABE, MASAYUKI
Applicants: YAMAHA MOTOR CO LTD, YAMAHA HATSUDOKI KABUSHIKI KAISHA
Application year: 1994
Main classification: C25D5
IPC codes: C25D7, C25D5